On January 13, 2021 Sesen Bio (Nasdaq: SESN), a late-stage clinical company developing targeted fusion protein therapeutics for the treatment of patients with cancer, reported that the Investigational New Drug (IND) application submitted to the Center for Drug Evaluation (CDE) of the China National Medical Products Administration (NMPA) by the Company’s partner in China, Qilu Pharmaceutical, was accepted for review. (Press release, Sesen Bio, JAN 13, 2021, View Source [SID1234573970]) If the IND is approved, Qilu will be authorized to conduct the proposed clinical trial to assess the efficacy and safety of VicineumTM in patients with non-muscle invasive bladder cancer (NMIBC) in Greater China. The Company’s lead program, Vicineum, also known as VB4-845, is currently in the follow-up stage of a Phase 3 registration trial in the United States (US) for the treatment of high-risk, bacillus Calmette-Guérin (BCG)-unresponsive NMIBC. In December 2020, the Company completed the Biologics License Application (BLA) submission for Vicineum to the FDA.

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"The IND submission and acceptance for review by the NMPA for Vicineum in China is a significant milestone for Sesen Bio and our mission of saving and improving the lives of patients with cancer around the world. This accomplishment further highlights the productive collaboration we have with our partner Qilu Pharmaceutical" said Dr. Thomas Cannell, president and chief executive officer of Sesen Bio. "Vicineum is a highly differentiated and potentially best-in-class therapeutic for the treatment of NMIBC. Given the positive Phase 3 trial results achieved in the US and the highly experienced clinical oncology team at Qilu Pharmaceutical, we are optimistic on the prospects for a successful trial. We look forward to continuing to work with Qilu Pharmaceutical and the NMPA to develop and commercialize Vicineum in China."

The proposed open-label, single-arm, multi-center bridging trial will evaluate the efficacy and safety of Vicineum in approximately 53 patients with carcinoma in situ (CIS) with or without papillary disease, high-grade Ta papillary disease or T1 papillary disease of any grade. Patients will be required to have failed previous treatment with BCG for inclusion in the trial. The primary endpoints are the complete response rate (for CIS patients) and the recurrence-free rate (for papillary patients) at 6 months, with the complete response rate and the recurrence-free rate at 3 months, safety and tolerability as the secondary endpoints.

Upon approval of the IND application by the NMPA, expected in the first half of 2021, Sesen Bio is entitled to receive a $3M milestone payment from Qilu Pharmaceutical, the first of $23M in potential milestone payments. China represents a large potential market for Vicineum, with peak year sales estimated at $155-418M. Furthermore, due to more limited use of BCG in China compared to the US, there is a major opportunity to transform the treatment paradigm of NMIBC in China and save and improve the lives of patients with cancer.

About Vicineum

Vicineum, a locally administered fusion protein, is Sesen Bio’s lead product candidate being developed for the treatment of high-risk non-muscle invasive bladder cancer (NMIBC). Vicineum is comprised of a recombinant fusion protein that targets epithelial cell adhesion molecule (EpCAM) antigens on the surface of tumor cells to deliver a potent protein payload, Pseudomonas Exotoxin A. Vicineum is constructed with a stable, genetically engineered peptide tether to ensure the payload remains attached until it is internalized by the cancer cell, which is believed to decrease the risk of toxicity to healthy tissues, thereby improving its safety. In prior clinical trials conducted by Sesen Bio, EpCAM has been shown to be overexpressed in NMIBC cells with minimal to no EpCAM expression observed on normal bladder cells. Sesen Bio is currently in the follow-up stage of a Phase 3 registration trial in the US for the treatment of high-risk NMIBC in patients who have previously received a minimum of two courses of bacillus Calmette-Guérin (BCG) and whose disease is now BCG-unresponsive. In December 2020, Sesen Bio completed the BLA submission for Vicineum to the FDA. Additionally, Sesen Bio believes that cancer cell-killing properties of Vicineum promote an anti-tumor immune response that may potentially combine well with immuno-oncology drugs, such as checkpoint inhibitors. The activity of Vicineum in BCG-unresponsive NMIBC is also being explored at the US National Cancer Institute in combination with AstraZeneca’s immune checkpoint inhibitor durvalumab.